ISL9103AIRUDZ-T

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The ISL9103AIRUDZ-T can be classified as a DC-DC switching regulator, which is a type of power management integrated circuit (PMIC). These regulators provide a reliable, efficient and cost effective solution for many power conversion needs. The ISL9103AIRUDZ-T is a high efficiency, low voltage, 150mA step-up switching regulator designed to convert, 2.9V to 5V input voltage range into a regulated output voltage of up to 5.3V. The switching frequency is up to 1MHz and the converter can be synchronized to an external clock.

Application Field:

The ISL9103AIRUDZ-T is an ideal choice for low-power system applications, such as wearable devices, embedded systems, and other cost-sensitive applications which require regulated DC voltages. It can be used in applications requiring a low voltage supply, such as LEDs, wireless charging, portable medical devices, and wireless power transfer systems. It can also be used for powering high frequency circuits, such as RFID, Bluetooth, and Wi-Fi, due to its fast switching frequency.

Working Principle:

The ISL9103AIRUDZ-T is a step-up voltage converter that utilizes a switching regulator topology operating at 1MHz. The converter combines a small size with large output currents that can be adjusted from 0.02A to 150mA. The switching operation of the component is controlled by an internal oscillator. The internal oscillator sets the frequency of the switching operation and is set to 1MHz (with a tolerance of ±5%).

The device has a single external current-set resistor connected across the ENB and SS pins. As current flows through the external resistor, the internal circuitry adjusts the duty cycle of the regulator. Depending on the setting of the resistor, the current output will vary. As the output current increases, the duty cycle will increase in proportion. The maximum duty cycle is limited to 100%, and increasing the current output by more than this will result in the device saturating the load.

The device typically operates in either a Discontinuous Conduction Mode (DCM) or a Continuous Conduction Mode (CCM). When the device is operating in DCM, the output voltage will remain steady during the on/off cycle. When the device is operating in CCM, the output voltage will track the input voltage throughout the on/off cycle. The switching frequency is adjustable with an external clock, and it can also be synchronized with other components in the system. This enables the device to be used in a system that requires synchronized clock signals.

The ISL9103AIRUDZ-T features an adjustable Soft Start, which allows the device to start up without any inrush current. This is beneficial because it prevents any sudden surge of current that could damage the system. Additionally, the device features a low shutdown current and an adjustable current limit sensing threshold, which eliminates the need for an auxiliary supply voltage.

The device is designed to operate over a wide input voltage range and has a low input current draw. It is compatible with an SPI/I2C interface, allowing for the adjustment of many parameters, such as the output voltage, current limit and soft start.

In summary, the ISL9103AIRUDZ-T is a high efficiency, low voltage, step-up switching regulator, designed to provide regulated voltages up to 5.3V from a 2.9V to 5V input voltage range. It has a switching frequency of up to 1MHz and can be synchronized with an external clock. It also has adjustable Soft Start, low power consumption, adjustable current limit sensing and an SPI/I2C interface. The device makes an ideal choice for a wide range of low-power system applications.

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